Introducing Xlets and the Personal Basis Profile - Beginning Java ME Platform - page 233

In practice, the upshot of these restrictions is that many PBP implementations sup-
port only a single top-level window, so you can't construct applications with more than
one window. To determine whether or not the PBP implementation you're working with
has these limitations, you can query a system property for each limitation. Table 9-1
shows the system properties and their values.

Table 9-1. PBP System Properties and Their Values

Property Value

java.awt.AlphaComposite.SRC_OVER.isRestricted true if and only if

AlphaComposite.SRC_OVER is restricted

java.awt.Graphics2D.setStroke.BasicStroke. true if and only if the use of

isRestricted BasicStroke is restricted in

Graphics2D.setStroke

java.awt.event.MouseEvent.isRestricted true if and only if MouseEvent is restricted

java.awt.event.MouseEvent.supportLevel Level of support for MouseEvent ,if

restricted; undefined otherwise 1

java.awt.event.KeyEvent.isRestricted true if and only if KeyEvent is restricted

java.awt.event.KeyEvent.supportMask 2 Mask describing KeyEvent support, if

restricted; undefined otherwise

java.awt.Component.setCursor.isRestricted true if the cursor image cannot be

changed for any Component ; optionally
supported by platforms

java.awt.Frame.setLocation.isRestricted true if Frame location is limited to a single

value; optionally supported by platforms

java.awt.Frame.setResizable.isRestricted true if Frame resizability may not be

changed; optionally supported by
platforms

java.awt.Frame.setSize.isRestricted true if Frame size is limited to a single

value; optionally supported by platforms

java.awt.Frame.setTitle.isRestricted true if Frame titles may not be changed;

optionally supported by platforms

java.awt.Frame.setUndecorated.isRestricted true if Frame decorations may not be

changed; optionally supported by
platforms

1 The java.awt.event.MouseEvent.supportLevel property is 0 if the platform generates no mouse events, 1 if
the platform provides all events but pointer movement events, and 2 if it provides all events that the
AWT defines.
2 The java.awt.event.KeyEvent.supportMask is a bit mask where 1 indicates support for VK_LEFT and
VK_RIGHT keys, 2 indicates support for VK_UP and VK_DOWN keys, 4 indicates support for VK_0 through
VK_9 (a numeric keypad), and 8 indicates support for VK_A through VK_Z with VK_SPACE and
VK_BACK_SPACE (an alphanumeric keypad).